Looks like hands free will be next according to news reports today on TV. They are already saying that hands free are just as dangerous as using a hands on phone. Random breath tests are being talked about too.
On a related note, deaths in UK hospitals from hospital caught infections are now higher than road deaths. But saving lives in hospitals costs money, whereas saving people from demonised paedophile/murdering/terrorist/planet-killing motorists is a money earner.